6c de meme 



coi. n y = , lin. n y = v — i 



I -t- i)* - I - ^•■' 



> col. ■i.ny = — , lin. iwy = — v — i , 



on aura de plus 



cof. /2(x -Hj') = — 



inv 



^ -^ 2 « II ' 



^ » ( A- - r ) X) -^ H 



col. — = , 



2 2 Vl)« • 



fin. = V — r . 



2 2 V 'y // 



Enfin on aura 



■ du dv 



dx = ■ , dy =■ ; . 



Suppofons outre cela 



cof. (|8 -H ct ) = ^ , cof. z (y ~t- a) = B 

 cof. ( 3 — et ) = £ , cof. 2 (>- — a) = E , 



on aura 



cof. 2 « = ^ £ -+■ »/ ( I — ^^ ) X v^ ( I — £0 

 cof. 4 * = ^ £-H v/ ( I — ^^ ) X ^ ( I — £=) i 



done 



1 -i- BF -^V (i — 5^)xV(i — F^) = 



2 [ ^ £ -t-v/ ( I — ^^ ) X ^ ( I — £^ ) ] . . . (G) 

 Enfuite on aura, en faifant pour abreger, 



AE -^ y/l(i — v40 ( I — £0 ] = M, 



^iT _ v/[( , — 5^)( , — Fn] = N, 



. I H- M ^ . 1 - M 



cof. « = V , lin, « = V 



cof. IV = »^ , fm, ay = / 



2 ' 2 



